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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7a5fb284f7d6a0e175c6569bb3cf83e6784fcfdb5480351d4045fd7fe4a4af' 
  AND token = '43YRYf4Jd0DCeNvGzr3E16jsXlqthRgfNcd97YIGEV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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