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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd901bcbfb34de0e6ef383093b49996dd380d828590a71350e1becf21788f3e1d' 
  AND token = 'l7VL44Dd1EH0jYcOxG66N2THBu4supMCyayjEgwdbv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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