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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0621129f7094254b4327167a8ffa906a75806f68fd5c1f320767d08ff1fed69' 
  AND token = 'SO3zdAQI0kOshLDqC03Cxfm2WvEO8Qo/9wZ1vOEv7z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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