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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270df26e7dbf9f6d0a231cc3891b9b3017fb57265b680ecbf370e000907b1844' 
  AND token = 'v4Nx6t+iWG2oI7J8QolwL/Sn7mztIaI5Q/pma56e5Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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