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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7216ff07c2405ec86b7fe96f9865353a3ed1f5ed8117e202a45edbeabe016a23' 
  AND token = 'wVy1gsGK3Z76GFssYDIgvrWUfUDne1IEPCR/yfU/ts0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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