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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71516bd87b936fc12747ebde1de45ff22e4e09d4bf1940bdeaa7c1fc565ccf03' 
  AND token = 'UbYLS5pcYNHDH3+japi40NnS0do5npcOZa+ttFTFNcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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