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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee90dacd9d1bc43392de5b201dd4ce423d6ea69a6b0aa1da7b3daa37e0261b8d' 
  AND token = 's7a2Rpx9j1XO0a/33qgrQ3138SHBvu91sZ02bKSCUo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}