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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d060182049ec3646957cb120fd8ffe965581a4ad35614d6e43d39cd33218f4' 
  AND token = 'y4YWxEbaS9uQZOr7HzVOoBdj+bDWnMcpOeebZJAVHEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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