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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cdb140a4793e1c390023b1bc8ee3b649973fa9868b8fb213e3bb4bcaa0e2d6' 
  AND token = 'JySeXWyhTT44QPL9rGgji55VJ6e263EoZj1QV2Ju8Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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