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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55ff1bdb55485bdc7822d0372643ec63a8560e5a4859860dfeffab5724b3d61' 
  AND token = 'aSeAAyd0MPpS6N1g9xn4+SY8JPU75tSSZEChlP39laE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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