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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c6e2a226c607292349857816ad30be95c7ff3343ed0dcf3141ba42e04d94fe' 
  AND token = 'eC2E7+zgL7YR8bk/CwwEh3WjBk7Po+TSbHw91vWa4ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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