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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec994db7d7c25330987009b7e65899cf13c65f4a7346916436f74ff8866a9c6' 
  AND token = '8/GQE7MJa5DKH36+z4oIqOyJD85evv7FCIlZ41xoqEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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