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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a97fe36fca79f7e394178092bf46db0d78fdc188d3166ff71592400836dc59e' 
  AND token = '0M8zzgWC7YtmTQusF5nuI+DW6zP5+KYVabLknQ8Y8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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