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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ffdc39e5b65355d1ab93d145e4a0bd43ad8696a78fce3a14fd6e32768d20d9' 
  AND token = 'jX6tbOuBcFlhEGzvrfQGBS9LzPl22Hu/U16xxwnydEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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