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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d188ca2ec82a11f27f39e864be0697e880c1f01c4f18d0fd739f329aac405a' 
  AND token = 'DJwyd+1HYxc2m3R2jImPWWioB9xdjIgh8y+ihNSEHLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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