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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295ccc83c60f4808cac7da6a30bd6d5089921218a6be31d4cfed8a08f239cdba' 
  AND token = 'bUyNWTKfGU82IreocNRo90xtUscdQuIZuTwTQxq/V2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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