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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3536cc2f8a708e72ff245de44933a0bef4cfc445f269accc2a8f58ac5bb719' 
  AND token = 'alCgDmgbaMvn3PHkXOf5JQj7Km8kioj0ITVGsH2v01A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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