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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94548ac86b16876eb20b805488422bedbfc3676fd4dafb5424da0b81f8ef74ec' 
  AND token = 'u7LQasQ3fb9rUU0UMLMVV8YEOG9+G6ojOQTG/8YWuPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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