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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a19be0a00fb7cc7e37871c934e6f50701226dc44ba05ed3d2ba0ba868f65f4' 
  AND token = '2OGkL93bNsDGyLV2C86UUfH5BF+H2J+OtXhtkSl0sbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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