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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f6e5b558807b27e83ad4654382c718102357b3e83c0aea2db865698cb275ea' 
  AND token = 'rdPGkkB6tjGX7RFmw1MnIYDcY+vWIu02CCxL+J1RocY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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