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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9840db85dc93ae72474b9d20cea6eba078e78df74ed3ee497af3626581ecab36' 
  AND token = '1SjWgZFno0A67m7/6jIizMgSOyUIWKtIwmOWr7wm1nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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