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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b61b838bec3b2c82cecb1e87f254982d19251932e6c1d9e9bd75999338925e3' 
  AND token = '3qrv5h4dDbI6CTQiMoJyMHWkPPFfabVnMuvwq/6jfS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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