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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a084cfe7e9fab88c7bf6c08e5d633e5532bef487719c5f9e9a0cf3def7bdfa35' 
  AND token = 'iM6n/79nmNMeGd5hL7O73jU9U35E/lDz3p7cnaVs+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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