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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5444e99dca83b77d9985c31fbe2805d9499e27c33385c9743d18c6247f9a0bad' 
  AND token = 'Lzra6XGOrweAfYiApIUFp/ncSZ8zRu+L9DqW8uz0cXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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