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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72efce6a1b3b8212e7061c5192eb0d6fe5f94e46c3b9c644361cece8e5c2c5dd' 
  AND token = '2wnM0IXrgM7fMCCzxHf5UfchdvrePLK47HX5QZh0/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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