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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4da0addef9cda4e5d6d02ea4869ef9fc4c68aa8740a895bdc965cfaefd71d' 
  AND token = 'JGbQUMC/qLFVNsXi77lRysIv620oewTzidSUXbn7z78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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