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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b16a7218ae005b8f82a4fa5a1576a78b5fba994eae8375789f53dfd777b8a24' 
  AND token = 'X4mY4StMLAyFNyJRxUDXMuy66XYo98z0ceVaTQiRrCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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