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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1fcdd95b8cfa5dce771301c33be232c29a7ea76d284c3e400ab3f9064e3989' 
  AND token = 'FaCO78dLNJsnXF9IB+N3Q8FCjRESlJiTEbG9JYA8rq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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