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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7664c0894eef5fe05ff1b2df2c8367653fd3bfbbf1b67ea35b53396e37f879f' 
  AND token = 'Ni146oYRBM11EVTHUXAoT75jieR08aXSs4G88m0ArzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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