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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b6da119c5083d117e303c7ee2a1cc86c120c64628f27ed9e74412272fee260' 
  AND token = '949kPyFtfM6TGys/YRVov8k6FT7Qd5nAzxXuGsX9/mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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