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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d2bc608d8437ddb853efb49f81eb67b5688aaba248686ee70408e09bbfe3f5' 
  AND token = 'KejydCcLUhXCXxcZVic9u7vg/vZnCK/88PIMKBRoAoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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