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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26401870b7bc93ae92936589b93bb0c4cf34260a59534c5eb5949a305fac93f7' 
  AND token = 't9b40+vchCK/aWtxPgShTEmNfyFFqy5aUyLOEcQSBXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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