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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b845df6ccf14b0ef8e602887a0fa1364bf3a617c1784e561bb25b5e4584f43' 
  AND token = 'teU/yui04EeQBVhaZxMM1dnH7Jxw5QYERatHvmzqU8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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