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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb6cb800a8da85125323f68df45ae30d1e5be92fd8f7c99df65e6da1a752b54' 
  AND token = '1OzCBohZaE/cz9FUPwpF7IQFoEYWF4paFCT3hMDl/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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