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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9d2a15b12f53fd7fb41433d8094ca3926779554ab0535aa7cb7788dfd14c42' 
  AND token = '4vtPxoJREDBFP4VnRhr49faHwBqqaoN1iVF3jLV62H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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