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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c4a99f3f319499d7e6b51cf1761d42b213fffbd4e23469d981a68d70109f15' 
  AND token = '8uy611g0phCjW//0Ehc04KKSvlX+nVwiD0gLs+2jWjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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