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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23cec44053405615196acf493d6ade6069981ff5f948a831cb45c820a8a17b0' 
  AND token = '33+dwjq7uNzbXzcDja9BYO7FgfQY8qUZYjmP1W0AXA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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