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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b9813b68ab1ca1852823d654f268c9bfea046e84e3faee40d12a1679315791' 
  AND token = '9Nn+D4uRXbF5IbDQkr5g+MYGsnXbAcOZoJBWfj4AfDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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