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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f1b2b14a5ae74d22dd9a8b375b9f18f8b21a933aee3c4ad5e107daf499fc06' 
  AND token = 'dDHvB/wU+pQ/0Sin3MHypkorEeyh85nnuKaZWMXRBfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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