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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eda8cdef2bc134403279f021d1c008c695ca1eda50b7fe4df97d38fa9a6fa7a' 
  AND token = '9eyFAuO9cOdeaYj4ALmMi2xbMR6KEppU/NAQs+U6m/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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