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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6042fd7cfc57a19be00fdf66bbf7c28a78084e3958b07c2c20ed9ce7b0e46f9d' 
  AND token = '82z9cou9PnimN+s6T/40Smn7lpv9C8DvajikluGh0io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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