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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e287ca5b480047ccf24e4a7eda92aa8af03b85e6fea29a15152f07ff05dffb' 
  AND token = 'wzoD2abrHUCb4utCHjtb/R9R5Ex6CJKStpZFAQ6YMoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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