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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f35e199e89f21f8160792ecf766df706d13310c85854ef24f23b16653d9200a' 
  AND token = 'C5MYVkskXIZ8tN0ZvAtnkG4O2AY6za6w79jLpDxlxaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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