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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7409352122f3a6f4b0c795045c83529476bcb1578875ac4565269cef28e3c66' 
  AND token = 'wdus/uadTSx9hf9W6J/tgJu9W5MVFcCH7N4atMirvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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