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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c92f40ff7c64f3060e2a607649379835c2c3e8917cf5bf43ac79b8ea5a75065' 
  AND token = 'iTBiATQpvzMMqC0dy83Qx7Ika1FzIJVGfIWJhysUwbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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