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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b93a6a61a1931dd1007a584a08d6896a4a31fec7b7d8a823465d6eba122e7b' 
  AND token = 'ZpJARiQHziiH8hY68knf5IjPzJ4JnkdrY4WbIpLkjXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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