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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdcf61c4f134ce8de899ee2ef1c05846431a5b7fcfca456b83afebb310c723e' 
  AND token = 'c82FryG4UyIh+AK+jauEyf+bHaX0A1I3XG2+pzGno9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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