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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e3f7ab71770b76ed58f2d177ecbd838d516064ba2694961c322db1475f534d' 
  AND token = 'Ql8C4Tg8Lb9kLvO8udEfUVg04M7hmTk1FhFYTQ9ggiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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