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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bebf239d7ec728d2b4637435b0cae7fb0da62fda4ba67c3289fc5029d8000d' 
  AND token = 'inVl5YrLhrQh7t5I9ipNPN5DvykURV4A1xSbHFW7c6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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