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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94e5ab26de3fb150ae10aca8a0553ac2302d8a9fb2e0c521834a4bcdbb50361' 
  AND token = 'FadYXtQcz45EiW+6evVdOOyujMjHBuPamXMvgyX8SKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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