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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9d4ba6764ad917073e4a881d29afebb306d87f70d043ed1dae9ed04ed7906a' 
  AND token = 'PX3M5rZz76J7ntBpw8zQMg7mQW76/uhEe0vNh8EsNis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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