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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9f01bc97a4d19ed0bb41d0156eaa85e7f7f0abcbfea0bb58e517ed95886d93' 
  AND token = 'AcGO6vhAtS9jUIOEom2jliQGxeU5KEW9mX3NS4aYNUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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