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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb54ddd987ae197a2fed11d7a15572ee5538ffb19b15c5b3dd9399842b44038' 
  AND token = '9WsoRqRw4vuEKqzKpSs3KO60MR23YDdq8aIaL3/hbMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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