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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64dd9a7b154d67b12f4fd5a9e286f595a11f50274cf06a0b88e89d044b6c857' 
  AND token = 'FBhdHEbxKSWhg3vhOu763RPje2kHXtRQb5Jm2lasIpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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