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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238edd918b507485245d4fe74ab00b021d5de4f133a25c4fdbd09d3df121ee45' 
  AND token = 'bleRmWyKs5g5dEZ/Bss2gLZ6IMZKOx9ckjUoow5fEfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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