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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa99caa843bad3859350dac724a1c894cee8d70c967f86df6d6f78c00bb46ca8' 
  AND token = 'qCKenJ4CaOIk+tYTHfdqneETTTqmRqjDvUXJ7M7b7KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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