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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3e7ebd7b3cc9b89058779cb4d9a7eafd6f127008a10ed276a84c46046f9f91' 
  AND token = 'av7todeP+7zLLn77RomGWf5iCN3CogeqLb48ANN587w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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