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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6066d3dcfe2165192bd89373de28c578d1e3927f783943d912a47baa4fc0d5c8' 
  AND token = 'NQ3jq78Kw5ZZX9A4IjIQ3yaVE9ga2FaDWAZWdeQFr7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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