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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e8998c4d7c71bfb10794c7a57772e79c8e54946f5b6dd7d09aa2247560d96f' 
  AND token = 'LRhIxE1sH41HzCclJJ8WHHn5Woo0vPzA/90iCcXrJOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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