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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db834bf90d8a251dd9afa525ecd68f8a51f3779424b7df2caabcf94488b8b7d5' 
  AND token = '5y4jObfRU6Ox6/ZF/326EofxmAnJy6NHinJSp84kstM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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