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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a2b5c9267cd38a66cbf8338175d7a43567072643f5105f83f2d5bff2a6497a' 
  AND token = 'GtSKgTNs1bn08j0AFNr/Pq77XMO3nnsPF5Gqo9wRN+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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