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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba91f5c09c7a1d67231fbb382c5560f1ff3451e88ed6dcc5da50fc42f3f5e892' 
  AND token = 'ov+B4zExL0gOziYqo1Udu4x4mT6jh712rR022qAMQwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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