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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb70c802594c91e46a0804afe111a5b2cea1c856346e293bd4c2b7efb74f62f' 
  AND token = 'm8m7QzlLTFIhMiGMZoUbPuha2NL608AFePIHylEfWqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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