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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547f33f0793fa432743e82027c2ae29bcb3265c9f64bf4123b62dd74f7e7ea32' 
  AND token = 'yABawNgu6nNvkfKW88LdwgE9oibQ470B7Kxzm9WmR7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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