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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acaebd22dbca72a2d53121c82a4f2edd58350ddbdd9090770389623fdef8bd15' 
  AND token = '4phILQ+1nNAmoGROK097qXNHFA7ts2kD28xbrAL9Ln8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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